JP6675184B2 - Rubber coupling - Google Patents

Description

  The present invention relates to a rubber coupling as an elastic shaft coupling connecting two shafts of a power transmission system such as a power transmission system between a transmission and a differential.

  A rubber coupling connected to a power transmission system between the transmission and the differential needs to absorb rotational vibration (pulsation) of the engine and suppress vibration caused by backlash of the differential gear, thereby transmitting rotation smoothly. Further, it is necessary to connect a universal joint to the power transmission system to absorb the eccentricity and the angle of intersection of the transmission and the differential shaft.

  In Patent Documents 1 and 2, circumferential bolts (connecting elements) for connecting a driving system and a driven system are provided in a circumferential direction of an elastic body, these connecting elements are connected by a cord, and this is covered with rubber. A rubber coupling is proposed in which a rotational driving force is transmitted from a driving side to a driven side, and the eccentricity and the angle of intersection are absorbed by a universal joint.

JP-A-5-64537 JP 2014-163501 A

  However, connecting with a cord requires a manufacturing cost, and it is difficult to control the degree of vibration damping due to torque fluctuation due to engine vibration or transmission backlash. Further, it is difficult to support the eccentricity and the angle of intersection by the elastic force of the rubber of the rubber coupling, and there is a problem that a universal joint is required.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problem, to control the degree of vibration damping due to torque fluctuation due to engine pulsation and transmission backlash, and to eliminate the need for a universal joint due to an eccentric load and an angle of intersection. Is to provide a ring.

  In order to achieve the above object, the present invention provides a rubber coupling connected to a power transmission system between a transmission and a differential, wherein a metal plate and a plurality of metal cylinders provided along a circumferential direction of the plate. And an inner bush provided coaxially within the cylinder, and formed by rubber molding so as to surround the inner member and fill the clearance between the cylinder and the inner bush with rubber. And a rubber member.

  It is preferable that a bush is inserted into the inner bush in the circumferential direction, and alternately fastened to the connection flange of the drive system and the connection flange of the driven system by bolts and nuts in the circumferential direction of the bush.

  It is preferable that a slit is formed in the plate between the cylindrical portions to adjust the degree of bending of the plate.

  The inner member is preferably formed by press-forming the plate and the cylindrical portion.

  The present invention exerts an excellent effect that power can be transmitted by absorbing rotation pulsation and vibration, and rotation can be smoothly transmitted by being elastically deformed freely even with respect to eccentricity.

It is a perspective view showing one embodiment of a rubber coupling of the present invention. (A) is a sectional view of FIG. 1, and (b) is a right side view of (a). It is the front view which showed the rubber coupling of FIG. 1 in cross section. FIG. 3 is a diagram illustrating details of an inner member illustrated in FIG. (A)-(e) is sectional drawing which shows the manufacturing process of the rubber coupling of this invention. It is a figure showing the modification of the inner member in the rubber coupling of the present invention. 7A is a cross-sectional view of a rubber coupling using the inner member of FIG. 6, and FIG. 7B is a right side view of FIG. (A)-(f) is sectional drawing of the rubber coupling which deformed the inner member variously. (A)-(c) is a figure which shows the example of the inner member which deformed the slit of the plate. It is a figure which shows the load change with respect to the stroke change when changing an inner member variously in this invention. It is a figure which shows the relationship between the torsion angle of an inner member and torque in this invention. It is a figure showing the state where it was connected to the power transmission system of the engine of the rubber coupling of the present invention.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, a power transmission system to which the rubber coupling of the present invention is applied will be described with reference to FIG.

  As shown in FIG. 12, the power of the engine 10 is input to the transmission 11 and transmitted from the transmission 11 to the differential 13 via the propeller shaft 12.

  The propeller shaft 12 is composed of a first propeller shaft 12a connected to the transmission 11 and a second propeller shaft 12b connected to the differential 13, and these first and second propeller shafts 12a, 12b are connected by a universal joint 14. And is supported by a chassis frame (not shown) by a center bearing 15.

  The first and second propeller shafts 12a and 12b are connected to the transmission 11 and the differential 13 by the rubber coupling 20 of the present invention.

  The rubber coupling 20 of the present invention can control the vibration attenuation of the engine 10 and the vibration caused by the torque fluctuation due to the backlash of the transmission 11 and the differential 13, and also reduces the eccentric load due to the vertical movement of the differential 13 suspended on the chassis frame. The universal joint can be received without the need for a universal joint.

  The rubber coupling 20 will be described with reference to FIGS.

  As shown in FIG. 2A, a plurality of rubber couplings 20 are provided along the circumferential direction of the flexible plate 22 made of metal or resin and formed in an annular shape. An inner member 21 formed of a metal tubular portion 23, an inner bush 24 provided coaxially within the tubular portion 23, and an inner member 21 that surrounds the inner member 21 by rubber molding and is formed between the tubular portion 23 and the inner bush 24. And a rubber member 25 formed so as to fill the clearance c with rubber.

  As shown in FIG. 4, the inner member 21 has a cylindrical portion 23 formed in the circumferential direction of the annular plate 22 at intervals of, for example, 60 degrees, and a slit 26 extending in the radial direction of the plate 22 between the cylindrical portions 23. Is formed.

  In the inner member 21, the plate 22 and the cylindrical portion 23 are formed by pressing or machining, and then the slit 26 and the center hole 27 are formed by pressing or machining.

  With the inner bush 24 inserted into the cylindrical portion 23 of the inner member 21, the inner bush 24 is set in a mold, and the rubber member 25 is injection molded to obtain the rubber coupling 20.

  As shown in FIGS. 2A and 2B, a coupling bush 28 is inserted into the inner bush 24 of the rubber coupling 20. The coupling bushes 28 are inserted alternately from the front and back of the rubber coupling 20 into the circumferential inner bush 24.

  FIGS. 5A to 5E show a manufacturing process of the rubber coupling 20.

  As shown in FIG. 5A, first, the inner member 21 and the inner bush 24 are separately formed.

  As shown in FIG. 5B, a mold 30 for molding the rubber member 25 includes a lower mold 31 and an upper mold 32. The lower mold 31 has an annular cavity 33 for molding the rubber member 25. Is formed, and a support protrusion 34 for holding the inner bush 24 is formed in the cavity 33.

  The inner bush 24 is fitted into the support protrusion 34 of the lower die 31, and the inner member 21 is arranged in the cavity 33 so that the cylindrical portion 23 of the inner member 21 and the inner bush 24 have a set clearance c.

  Next, as shown in FIG. 5 (c), the upper mold 32 is set on the lower mold 31, the cavity 33 is closed, and unvulcanized rubber is injected into the cavity 33 under pressure to injection-mold the rubber member 25. Thus, the rubber coupling 20 is manufactured.

  When the rubber member 25 is injection-molded, since the vulcanization temperature of the rubber is as low as 100 ° C. or less, the mold 30 is heated to the vulcanization temperature or more, for example, around 200 ° C.

  After the injection molding, the rubber coupling 20 is taken out of the mold 30 as shown in FIG. 5D, and the coupling bush 28 is inserted into the inner bush 24 as shown in FIG. 5E.

  As shown in FIGS. 2A and 2B, the coupling bush 28 is inserted alternately from the front and back of the rubber coupling 20 into the inner bush 24 in the circumferential direction.

  An example in which the rubber coupling 20 is connected to a power system of an engine will be described with reference to FIGS.

  As shown in FIGS. 1 and 3, the rubber coupling 20 into which the coupling bush 28 is inserted is located between the connection flanges 41i and 41o provided on the shafts 40i and 40o such as a propeller shaft, and the connection flanges 41i on both sides. The bolt holes 42i and 42o of 41o are arranged so as to be shifted by 60 degrees. In this state, the bolt 43i is inserted into the coupling bush 28 through the bolt hole 42i of the connection flange 41i, and the nut 44i is screwed into the bolt 43i protruding from the coupling bush 28, so that one of the connection flanges 41i is connected to the rubber cup. Connected to ring 20.

  Similarly, the other connection flange 41o is connected to the rubber coupling 20 by inserting the bolt 43o into the coupling bush 28 of the rubber coupling 20 from the bolt hole 42o and screwing the nut 44o. Is done.

  As described above, by connecting the shafts 40i and 40o to each other with the rubber coupling 20, the rotational force is transmitted from the bolt 43i of the one connection flange 41i to the coupling bush 28 and the inner bush 24, and the inner bush 24 and the inner bush 24 are connected to each other. It is transmitted to the inner member 21 via the rubber layer 25c of the rubber member 25 interposed in the clearance c between the cylindrical portions 23 of the member 21, and is transmitted to the rubber coupling 20 together with the inner member 21. The rotational force of the rubber coupling 20 is transmitted from the inner member 21 via the rubber layer 25c from the cylinder 23 on the side where the other bolt 43i is inserted, via the cylinder 23, the inner bush 24, and the coupling bush 28. And transmitted to the other shaft 40o via the other connection flange 41o.

  At this time, the rotation of the drive-side shaft 40i is transmitted to the driven-side shaft 40o by the inner member 21 via the rubber layer 25c between the inner bushes 24, and the rubber layer 25c is connected to the cylindrical portion 23 and the inner bush 24. It is held between them and deformed by its elastic force, so that the rotational force is smoothly transmitted.

  The rotation of the engine causes rotation pulsation of the drive-side shaft 40i. Even if there is pulsation in the rotation of the shaft 40i, the rubber layer 25c between the cylindrical portion 23 and the inner bush 24 can absorb the pulsation. Further, on the driven side shaft 40o side, the impact due to the backlash of the differential gear on the differential side can be absorbed by the rubber layer 25c.

  Further, since the differential between the drive side shaft 40i and the driven side shaft 40o always moves up and down, the shaft centers do not coincide with each other and the shafts are eccentric and the rotation is transmitted, but the rotation is transmitted. Since the inner member 21 can bend in accordance with the eccentricity, the eccentricity can be allowed. At this time, in the inner member 21, a slit 26 is formed in a plate 22 connecting the driving-side cylinder portion 23 and the driven-side cylinder portion 23, and the inner member 21 is covered with a rubber member 25. Therefore, it is possible to smoothly transmit the eccentric rotation of the drive-side shaft 40i and the driven-side shaft 40o while allowing the eccentricity and the intersection angle between the drive-side cylinder portion 23 and the driven-side cylinder portion 23. Becomes

  6 and 7 show another embodiment of the present invention.

  In the embodiment shown in FIGS. 2 to 4, the example in which the slit 26 of the inner member 21 is opened in the hole 27 has been described. In the present embodiment, however, the slit 26 a is formed as shown in FIG. The inner member 21 is formed by being formed between the holes and not being opened to the hole 27, and the inner member 21 is used to form a rubber coupling as shown in FIGS. 7 (a) and 7 (b). 20.

  In the rubber coupling 20, the bending strength of the plate 22 of the inner member 21 is increased because the slit 26 a is closed without opening to the hole 27, but the eccentricity of the shafts 40 i and 40 o is increased. When the angle of intersection is small, there is an advantage.

  FIG. 8 shows another embodiment of the present invention.

  In the embodiments of FIGS. 2 to 4, 6 and 7, the pulsation can be absorbed by the rubber layer 25 c between the cylindrical portion 23 and the inner bush 24, but when the eccentricity and the angle of intersection are large, the rubber layer 25 c There is a limit on the spring constant in the torsional direction determined by the thickness (clearance) and hardness. The plate 22 bends in accordance with a change in the distance (stroke) between the two axes of the power system. However, the adjustment of the load due to the bending of the plate 22 in response to the change in the stroke has a limit only by the slit 26.

  Therefore, in the embodiment of FIGS. 8A to 8F, the rubber coupling 20 is adapted to the case where the eccentricity and the intersection angle of the two axes of the power system are large.

  FIG. 8A shows a structure in which a sufficient space is provided between the inner bush 24 and the cylindrical portion 23 of the inner member 21, and an adjusting bush 29a for adjusting the torsional spring constant is provided therebetween.

  In the rubber coupling 20 shown in FIG. 8A, the adjusting bush 29a swings even if the eccentricity and the angle of intersection are large, and the swinging power can be transmitted to the plate 22 via the cylindrical portion 23. The torsion direction spring constant can be adjusted by the rubber layer 25c between the adjusting bush 29a and the inner bush 24.

  FIG. 8B shows a bulge portion 35b formed by expanding a center portion of the adjustment bush 29b outward, and joining the bulge portion 35b to the cylindrical portion 23.

  In the rubber coupling 20 shown in FIG. 8B, the change in the eccentricity or the angle of intersection of the coupling bush 28 (the inner bush 24) is directly transmitted to the plate 22 via the cylindrical portion 23 as bending, and the torsion is also caused. The directional spring constant is adjusted by the rubber layer 25c between the inner surface of the inner bush 24 and the inner surfaces of the upper and lower adjustment bushes 29b of the bulge portion 35b.

  FIG. 8C shows the vertical width of the rubber layer 25c between the inner surface of the inner bush 24 and the inner surface of the upper and lower adjustment bushes 29c of the bulge portion 35c by increasing the vertical width of the bulge portion 35c of the adjustment bush 29c. (B) is made smaller to change the spring constant in the torsional direction.

  FIG. 8D shows that the bulge portion 36 is formed by expanding the center portion of the tubular portion 23a and joining the bulge portion 36 to the plate 22, and the thickness of the plate 22 supporting the tubular portion 23a is increased. It is formed.

  FIG. 8E shows a plate 22 in which a plate 22b having a support tube 22a formed so as to cover the tube 23a is opposed to each other.

  8 (d) and 8 (e), the bending strength of the plate 22 can be freely adjusted by changing the thickness and the cross-sectional shape of the plate 22 of the inner member 21.

  FIG. 8F shows a case where a divided inner member 21c is formed by a metal plate 22c and a plurality of metal cylindrical portions 23c provided along the circumferential direction of the plate 22c, and the divided inner member 21c is back-to-back. When the plate 22c is joined by projection welding or spot welding, or when the inner member 21c is formed of resin such as FRP, the inner member 21 is formed by bonding with an adhesive. In this inner member 21, the cylindrical portion 23c of the divided inner member 21c is formed in a truncated cone shape inclined toward the coupling bush 28, and the torsional direction characteristics are adjusted by changing the inclination angle θ with respect to the axial direction. Can be.

  That is, the rubber layer 25r located between the upper and lower cylindrical portions 23c is compressed by the change in the eccentricity and the intersection angle of the coupling bush 28 (the inner bush 24). Since the density changes due to the compression of 25r, the characteristics in the torsional direction can be adjusted.

  FIG. 9 shows an example in which the shape of the slit 27 formed in the plate 22 of the inner member 21 is changed to adjust the bending strength of the plate 22.

  FIG. 9A shows an inner member for increasing the diameter of the cylindrical portion 23 of the rubber coupling 20 shown in FIGS. 8A to 8C and inserting the adjustment bushes 29a to 29c. 21 is an example.

  FIG. 9B shows an inner member 21 obtained by joining a plate 22 having a cylindrical portion 23 to a slit plate 22p having slits 26a and 27b.

  FIG. 9C shows a state in which a slit 26 c is formed in the plate 22 in the circumferential direction to form the inner member 21.

  As shown in FIGS. 9A to 9C, the inner member 21 can freely adjust the bending strength of the plate 22 by deforming the slit shape.

  FIGS. 10 and 11 show a method of selecting an inner member of the rubber coupling 20 when connecting two shafts of the power system.

  First, as shown in FIG. 10, the load due to the deflection of the plate with respect to the change in the distance (stroke) between the two axes is determined by the eccentricity and the angle of intersection between the two axes of the power system. When the bending load is 1000 Nmm, the load change due to the thickness and shape of the plate is obtained for each of the plates A to D.

  At this time, it is assumed that the plate D satisfies the required value.

  Next, as shown in FIG. 11, the relationship between the torsion angle and the torque is determined based on the spring constant in the torsional direction of the rubber coupling.

  For example, if the response of the transmission torque is required in a range from a dotted line lmax indicating the maximum torsional rigidity to a dotted line lmin indicating the minimum torsional rigidity, the physical properties of the rubber, the thickness of the rubber layer, and the material are selected. The hysteresis h of the response of the transmission torque can be set.

  As described above, according to the present invention, as a shaft coupling that connects two shafts of a two-power transmission system, a load change due to eccentricity or an angle of intersection is received by the degree of bending of the inner member, and the responsiveness of torque transmission is improved by the inner bush. The clearance c between the cylindrical member 24 and the cylindrical portion 23 of the inner member 21 is adjusted, and the spring constant in the torsional direction of the rubber layer 25c interposed between the clearances c is freely adjusted by adjusting the thickness, material, and hardness of the rubber layer. The power can be transmitted by absorbing the rotation pulsation and vibration, and the rotation can be smoothly transmitted by elastically deforming freely with respect to eccentricity.

  When the degree of eccentricity and the angle of change between the two axes of the two power transmission systems are large, the interval between the inner bush 24 and the cylindrical portion 23 of the inner member 21 is increased, and the eccentricity and the angle of intersection are increased. By providing the adjustment bush 29 for transmitting and selecting the spring constant in the torsional direction, the rotation can be transmitted without any trouble even if the eccentricity or the change in the angle of intersection is large.

DESCRIPTION OF SYMBOLS 11 Transmission 13 Differential 20 Rubber coupling 21 Inner member 22 Plate 23 Tube part 24 Inner bush 25 Rubber member

Claims (8)

In a rubber coupling that connects two axes of a power transmission system,
An inner member formed of a flexible plate and a plurality of cylindrical portions provided along the circumferential direction of the plate,
An inner bush provided coaxially in the cylindrical portion,
A rubber member surrounding the inner member by rubber molding and a rubber member formed so as to fill a clearance between the cylindrical portion and the inner bush with rubber ,
A rubber cup characterized in that a bush is inserted into the inner bush in the circumferential direction, and the bush is alternately fastened to the connection flange of the drive system and the connection flange of the driven system by bolts and nuts in the circumferential direction of the bush. ring. In a rubber coupling that connects two axes of a power transmission system,
An inner member formed of a flexible plate and a plurality of cylindrical portions provided along the circumferential direction of the plate,
An inner bush provided coaxially in the cylindrical portion,
A rubber member surrounding the inner member by rubber molding and a rubber member formed so as to fill a clearance between the cylindrical portion and the inner bush with rubber ,
A rubber coupling characterized in that the plate has a thickness, a material, a shape, and a slit formed in the plate, and the degree of bending of the inner member is adjusted . In a rubber coupling that connects two axes of a power transmission system,
An inner member formed of a flexible plate and a plurality of cylindrical portions provided along the circumferential direction of the plate,
An inner bush provided coaxially in the cylindrical portion,
A rubber member surrounding the inner member by rubber molding and a rubber member formed so as to fill a clearance between the cylindrical portion and the inner bush with rubber ,
A rubber coupling wherein a spring constant in a torsional direction is adjusted by a rubber layer between a clearance between the cylindrical portion and the inner bush . In a rubber coupling that connects two axes of a power transmission system,
An inner member formed of a flexible plate and a plurality of cylindrical portions provided along the circumferential direction of the plate,
An inner bush provided coaxially in the cylindrical portion,
A rubber member surrounding the inner member by rubber molding and a rubber member formed so as to fill a clearance between the cylindrical portion and the inner bush with rubber ,
A rubber coupling , wherein the inner member comprises a plate and a cylinder formed by press molding . In a rubber coupling that connects two axes of a power transmission system,
An inner member formed of a flexible plate and a plurality of cylindrical portions provided along the circumferential direction of the plate,
An inner bush provided coaxially in the cylindrical portion,
An adjusting bush provided between the inner bush and the cylindrical portion, for transmitting the swing of the inner bush to the plate via the cylindrical portion;
A rubber coupling, comprising: a rubber member formed by rubber molding so as to surround the inner member and to fill a clearance between the cylindrical portion, the adjusting bush, and the inner bush with rubber. 6. The rubber cup according to claim 5 , wherein a bush is inserted into the circumferential inner bush, and alternately fastened to the connection flange of the drive system and the connection flange of the driven system by bolts and nuts in the circumferential direction of the bush. ring. 7. The rubber coupling according to claim 5 , wherein the plate has a thickness, a material, a shape, and a slit formed in the plate, and the degree of bending of the inner member is adjusted. The rubber coupling according to any one of claims 5 to 7, wherein the adjustment bush is joined to a cylindrical portion of the inner member.

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